ulib uprintf to pipe not termdev, ulib Add stringbuffer and linearlist, tb Capture subshell output

ulib/_premain.c

@@ -21,7 +21,7 @@ void clearbss(void) {
   }
 }
 
-#define MAX_ARGS 15
+#define MAX_ARGS 25
 static char *_args[MAX_ARGS];
 
 size_t _argslen;
@@ -34,14 +34,10 @@ size_t argslen(void) {
   return _argslen;
 }
 
-Dev_t termdev;
-
 // ulib initialization goes here
 void _premain(void) {
   clearbss();
 
-  devctl(&termdev, DEVCTL_GET_HANDLE, (uint8_t *)DEV_TERMDEV, 0, 0);
-
   for (size_t i = 0; i < ARRLEN(_args); i++) {
     _args[i] = umalloc(PROC_ARG_MAX);
   }